The Femto Forum has hooked up with the Next Generation Mobile Network alliance to push femtocells into network planning for 4G deployments, potentially cutting costs and allowing a more phased roll-out.
The two bodies have agreed to work together developing the necessary standards to allow network operators, whether using WiMAX …

boring!

Unintended application:

I can already see a use for femtocells which the operator might not have thunk of: Avoiding roaming charges. Bring your own femtocell while traveling, and you no longer need to roam onto the local networks; better that than leaving it unused at home.